*This quiz addresses the requirements of the National Curriculum KS1 Maths and Numeracy for children aged 6 and 7 in year 2. Specifically this quiz is aimed at the section dealing with adding in a different order.*

In Year 2, children are encouraged to check their addition calculations. They might do this by adding the numbers up again, but in a different order. For example, if they add up 6 + 9 + 4, they may check it by recognising that 6 + 4 makes 10, and 9 more is 19, or they may do it differently by adding 4 + 9 to make 13 then adding 6 to give 19. This is called the commutative property and means that addition calculations can be done in any order to achieve the same answer.

Question 1

What is 5 + 5 + 10 + 5 + 5

25

35

30

40

Starting at 10 and counting up in 5s, or adding up all the 5s and then 10 more are both good strategies

Question 2

What is 2 + 30 + 8?

37

48

35

40

Adding the 2 and 8 first gives 10, which is easily added to 30

Question 3

What is 16 + 70 + 4?

90

80

78

87

Spotting the bond to 20 makes this calculation become much easier

Question 4

What is 2 + 60 + 4?

75

67

56

66

Adding the smaller numbers first and then adding them to 60 is the best option

Question 5

What is 1 + 35 + 34?

70

60

75

65

Adding the 1 to the 34 gives 35. 35 + 35 = 70

Question 6

What is 3 + 22?

26

25

27

23

Starting at 3 and counting on 22 would take longer than swapping the order of the numbers around!

Question 7

What is 1 + 1 + 85 + 1 + 1?

89

88

86

98

Starting at 85 and counting on 4 is perfectly acceptable

Question 8

What is 12 + 13 + 11 + 10?

54

48

46

44

Adding together all the tens and then the units and combining the two totals is a useful way of solving this

Question 9

What is 2 + 14 + 18 + 6?

45

35

50

40

Recognising that there are two pairs of bonds to 20 makes it much easier to solve this

Question 10

What is 10 + 43 + 10 + 2

67

65

75

66

Counting up in tens from 43 and finally adding the 2 makes this calculation easy